John Guretzky Assistant Professor and Grassland Systems Ecologist
Area of Focus
Grassland Systems Ecology
- B.S., Natural Resources (Environmental Studies), University of Nebraska-Lincoln, 1996
- Ph.D., Crop Production and Physiology, Iowa State University, 2002
- Structure and function of grassland systems
- Forage-beef production systems
- Use of perennial grasses in biomass energy systems
- Forage crop and range management
- Perennial plant function, growth, and development
- Grassland research techniques and analysis
- Providing Nebraskans with the best information available about forage and grasslands to meet their production and land management goals
Biermacher, J.T., R. Reuter, J. Guretzky, M. Kering, J. Rogers, J. Blanton, Jr., and T. Butler. 2012. Expected economic potential of substituting legumes for nitrogen in bermudagrass pastures. Crop Science. Accepted / In Press.
Guretzky, J.A., T.J. Butler, and J. Muir. 2012. Adaptation of annual forage legumes in the southern Great Plains. Great Plains Research. Accepted / In Press.
Kering, M.K., J.T. Biermacher, T.J. Butler, J. Mosali, and J.A. Guretzky. 2012. Biomass yield and nutrient responses of switchgrass to phosphorus fertilization. Bioenergy Research. 5:71-78.
Kering, M.K., T.J. Butler, J.T. Biermacher, and J.A. Guretzky. 2012. Biomass yield response of five perennial grasses to four nitrogen rates. Bioenergy Research. 5:61-70.
Kering, M.K., J. Guretzky, J. Mosali, and E. Funderburg. 2011. Effect of nitrogen fertilizer rate and harvest season on forage yield, quality, and macronutrient concentrations in ‘Midland' bermudagrass. Communications in Soil Science and Plant Analysis 42:1958-1971.
Guretzky, J.A., J.T. Biermacher, B.J. Cook, M.K. Kering, and J. Mosali. 2011. Switchgrass for forage and bioenergy: harvest and nitrogen rate effects on biomass yields and nutrient composition. Plant Soil. 339:69-81.
Guretzky, J.A., M. Kering, J.T. Biermacher, E. Funderburg, and J. Mosali. 2010. Fertilizer rate effects on forage yield stability and nutrient uptake of Midland bermudagrass. Journal of Plant Nutrition. 33:1819-1834.
Guretzky, J.A., M.K. Kering, J.T. Biermacher, and B.J. Cook. 2009. Switchgrass for forage and bioenergy: II. Effects of P and K fertilization. The Proceedings of the International Plant Nutrition Colloquium XVI. University of California, Davis. Online. http://repositories.cdlib.org/ipnc/xvi/1318.
Kering, M.K., J.T. Biermacher, B.J. Cook, and J.A. Guretzky. 2009. Switchgrass for forage and bioenergy: I. Effects of nitrogen rate and harvest system. The Proceedings of the International Plant Nutrition Colloquium XVI. University of California, Davis. Online. http://repositories.cdlib.org/ipnc/xvi/1158.
Guretzky, J.A., Ball, J., and Cook, B.J. 2008. Nitrogen fertilizer rate and weather dictate nutritive value of fall stockpiled bermudagrass. Online. Forage and Grazinglands doi:10.1094/FG-2008-0118-01-RS.
Guretzky, J.A., K.J. Moore, C.L. Burras, and E.C. Brummer. 2007. Plant species richness in relation to pasture position, management, and scale. Agriculture, Ecosystems & Environment. 122:387-391.
Guretzky, J.A., J.S. Fehmi, and A.B. Anderson. 2006. Grazing and military vehicle interaction on grassland soils and vegetation. Great Plains Research. 16:51-61.
Guretzky, J.A., K.J. Moore, E.C. Brummer, and C.L. Burras. 2005. Species diversity and functional composition of pastures that vary in landscape position and grazing management. Crop Science. 45:282-289.
Guretzky, J.A., K.J. Moore, C.L. Burras, and E.C. Brummer. 2004. Distribution of legumes along gradients of slope and soil electrical conductivity (ECa) in pastures. Agronomy Journal. 96:547-555.
Guretzky, J.A., K.J. Moore, A.D. Knapp, and E.C. Brummer. 2004. Emergence and survival of legumes seeded into pastures varying in landscape position. Crop Science. 44:227-233.
- Guretzky, J.A. and S.M. Louda. 1997. Evidence for natural biological control: insects decrease survival and growth of a native thistle. Ecological Applications. 7:1330-1430.